Epson TM-P20 Technical Reference Guide
Technical Reference Guide
Describes features of the Product.
Describes setup and installation of the product.
Describes advanced usage methods for the product.
Describes how to control the printer and necessary
information when you develop applications.
Describes how to handle the product.
Describes general specications and character code tables.
Product Overview
Setup
Advanced Usage
Application Development Information
Handling
Appendix
M00080010
Rev. J
Cautions
• No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by
any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of Seiko Epson Corporation.
• The contents of this document are subject to change without notice. Please contact us for the latest information.
• While every precaution has been taken in the preparation of this document, Seiko Epson Corporation
assumes no responsibility for errors or omissions.
• Neither is any liability assumed for damages resulting from the use of the information contained herein.
• Neither Seiko Epson Corporation nor its affiliates shall be liable to the purchaser of this product or third par-
ties for damages, losses, costs, or expenses incurred by the purchaser or third parties as a result of: accident,
misuse, or abuse of this product or unauthorized modifications, repairs, or alterations to this product, or
(excluding the U.S.) failure to strictly comply with Seiko Epson Corporation’s operating and maintenance
instructions.
• Seiko Epson Corporation shall not be liable against any damages or problems arising from the use of any
options or any consumable products other than those designated as Original Epson Products or Epson
Approved Products by Seiko Epson Corporation.
Trademarks
EPSON is a registered trademark of Seiko Epson Corporation.
Exceed Your Vision is a registered trademark or trademark of Seiko Epson Corporation.
Microsoft
States and/or other countries.
Wi-Fi
The Bluetooth
such marks by Seiko Epson Corporation is under license.
IOS is a trademark or registered trademark of Cisco in the U.S. and other countries and is used under license.
Apple, Apple TV, Apple Watch, iPad, iPad Air, iPad Pro, iPhone, and Lightning are trademarks of Apple Inc.,
registered in the U.S. and other countries. tvOS is a trademark of Apple Inc.
QR Code is a registered trademark of DENSO WAVE INCORPORATED in Japan and in other countries.
Android™ is a trademark of Google LLC.
Google Play and the Google Playlogo are trademarks of Google LLC.
All other trademarks are the property of their respective owners and used for identification purpose only.
®, Windows®, and Windows Vista® are registered trademarks of Microsoft Corporation in the United
®, WPA™, and WPA2™ are either registered trademarks or trademarks of Wi-Fi Alliance®.
® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of
ESC/POS® Command System
Epson ESC/POS is a proprietary POS printer command system that includes patented or patent-pending
commands. ESC/POS is compatible with most Epson POS printers and displays.
ESC/POS is designed to reduce the processing load on the host computer in POS environments. It comprises a
set of highly functional and efficient commands and also offers the flexibility to easily make future upgrades.
©Seiko Epson Corporation 2014-2020. All rights reserved.
2
For Safety
Key to Symbols
The symbols in this manual are identified by their level of importance, as defined below. Read the following
carefully before handling the product.
You must follow warnings carefully to avoid serious injury or death.
DANGER
You must follow warnings carefully to avoid serious bodily injury.
WARNING
Provides information that must be observed to prevent damage to the equipment or loss of data.
• Possibility of sustaining physical injuries.
CAUTION
• Possibility of causing physical damage.
• Possibility of causing information loss.
Provides information that must be observed to avoid damage to your equipment or a malfunction.
Provides important information and useful tips.
3
Cautions on Handling the Printer
Do not use or charge this product in high temperature places (60°C {140°F} or higher). Furthermore,
do not leave or store this product in places that are 60°C {140°F} or higher. Doing so could lead to heat,
DANGER
WARNING
smoke, ruptures, fire, or leaks.
• Do not use this product in a location with volatile substances such as alcohol or paint thinner, or
near fire. Doing so may cause electric shock or fire.
• Shut down the product immediately if it produces smoke, a strange odor, or unusual noise.
Continued use may cause electric shock or fire. When a fault or other problem occurs, immediately
shut down the product and remove the battery from the product. Then, contact qualified service
personnel.
• Shut down the product immediately if water or other liquid spills into this product. Continued use
may cause electric shock or fire. Immediately shut down and remove the battery from the product,
and contact qualified service personnel.
• Do not disassemble the areas other than those mentioned in this manual.
• Never repair this product. Tampering with this product may result in injury or fire.
• Do not use this product in an environment where flammable gas or explosive gas may exist. Do not
use aerosol sprayers containing flammable gas inside or around this product. Doing so may cause
fire.
• Do not connect cables in ways other than those mentioned in this manual. Doing so may cause fire.
It may also damage other devices.
• Do not touch the areas inside the product other than those mentioned in this manual. Doing so
may cause electric shock or burns.
• Do not insert metal or flammable materials, or allow them to fall into the product. Doing so may
cause electric shock or fire.
• Do not allow anyone to stand or place heavy objects on top of this product. Equipment may fall or
collapse, causing breakage and possible injury.
CAUTION
• Be sure to use within the limits of the environmental temperature conditions.
Cautions on Installation of the Printer
• Do not store/leave the product in an unstable location or in a location subject to vibration from
other devices. Doing so may cause injury. Also, it may cause malfunction of the printer.
CAUTION
• Do not install the product in a location exposed to oily smoke or dust, or in a humid location. Doing
so may cause electric shock or fire.
• Install the cables and optional products in the proper direction according to the proper procedures. Failure to install correctly may cause fire or injury. Follow the instructions in this manual to
install them properly.
4
Cautions on Handling the Single Charger
• Do not charge any device other than the TM-P20 printer or the OT-BY20 battery. Doing so may
cause heat, explosion, fire, leaks, or other damage.
WARNING
CAUTION
• Do not use this product in a location with volatile substances such as alcohol or paint thinner, or
near fire. Doing so may cause electric shock or fire.
• Shut down the product immediately if it produces smoke, a strange odor, or unusual noise. Contin-
ued use may cause electric shock or fire. When a fault or other problem occurs, immediately shut
down the product and unplug the product. Then, contact qualified service personnel.
• Shut down the product immediately if water or other liquid spills into this product. Continued use
may cause electric shock or fire. Immediately unplug the product, and contact qualified service
personnel.
• Do not disassemble the areas other than those mentioned in this manual.
• Never repair this product. Tampering with this product may result in injury or fire.
• Do not use this product in an environment where flammable gas or explosive gas may exist. Do not
use aerosol sprayers containing flammable gas inside or around this product. Doing so may cause
fire.
• Do not connect cables in ways other than those mentioned in this manual. Doing so may cause fire.
It may also damage other devices.
• Do not touch the areas inside the product other than those mentioned in this manual. Doing so
may cause electric shock or burns.
• Do not allow anyone to stand or place heavy objects on top of this product. Equipment may fall or
collapse, causing breakage and possible injury.
• Install the printer, cables and optional products in the proper direction according to the proper
procedures. Failure to install correctly may cause fire or injury. Follow the instructions in this manual to install them properly.
• Be sure to disconnect all the cables from the product before you move it. Otherwise the cables
could be damaged, potentially resulting in electric shock or fire.
• Be sure to use within the limits of the environmental temperature conditions.
Cautions on the Power Supply for the Single Charger
Be sure to use the specified AC adapter (Epson AC adapter C). Using any other power supply could
cause faults, fire or electric shock.
WARNING
5
Battery Safety Precautions
• Risk of fire and burns. Do not expose the battery to fire or heat it. This may cause fire, explosion,
leakage, overheating or damage.
DANGER
WARNING
• Never leave the battery where the temperature may become above 60°C {140°F}. This may cause
fire, explosion, leakage, overheating or damage.
• Do not directly solder the battery, and do not disassemble or modify it. This may cause fire, explosion, leakage, overheating or damage.
• Do not connect the terminals together. This may cause fire, explosion, leakage, overheating or
damage.
• Do not connect the battery directly to a power outlet or the cigarette lighter of an automobile. This
may cause fire, explosion, leakage, overheating or damage.
• If you cannot insert the battery smoothly, do not force it. This may cause fire, explosion, leakage,
overheating or damage.
• If any liquid from the battery gets into your eyes, promptly wash it out with clean water for more
than 10 minutes and consult your doctor at once. If you do not, the liquid may cause loss of eyesight.
• Do not crush. Do not crush the battery or puncture it with a pointed object such as a nail. These
may cause fire, explosion, leakage, overheating or damage due to internal short-circuit and heat
generation of the battery.
• Keep the battery out of the reach of children to avoid harm to the children.
• Do not use the battery with equipment other than TM-P20 printer, OT-SC20 battery charger, or
OT-MC20 battery charger. Doing so may cause fire, explosion, leakage, overheating or other damage.
• Unplug the charger if charging is still incomplete after the specified time it should take. Continuing
to charge the battery may cause fire, explosion, leakage, overheating or damage.
• Do not expose the battery to water. Do not allow water to contact the terminals. This may cause
fire, explosion, leakage, overheating or damage.
• Do not hit or throw the battery. This may cause fire, explosion, leakage, overheating or damage. Do
not use the battery if you find something wrong with it such as leakage, color change or deformity.
• Using the charger other than specified may cause fire, explosion, leakage, overheating or damage.
• Keep the battery away from fire or flame if it produces a strange odor or leakage. Otherwise fire,
explosion, leakage, overheating or damage may occur.
• Should any battery liquid get on skin or clothing, promptly wash it off with clean water. If you do
not, the liquid may damage your skin or clothing.
• Do not short the terminals with any metal objects such as a necklace. This may cause fire, explosion, leakage, overheating or damage, which lead to burn or injury.
• Before using the battery, make sure that its terminals are clean without any foreign substance on
them. Dirt and foreign substance on the terminals may cause fire, explosion, leakage, overheating
CAUTION
or damage.
• Do not touch the battery right after using it for a long time. It will be hot and may burn you.
• Risk of explosion if battery is replaced by an incorrect type.
• Dispose of used batteries according to the instructions.
• Be sure to use within the limits of the environmental temperature conditions.
6
Cautions for Use and Storage of the Battery
• Do not pull or push the battery hook forcefully.
• Keep the battery terminals clean, so that no dirt or foreign material becomes attached.
CAUTION
• When cleaning the battery, do not use any solvents, such as alcohol, benzine, or thinner. Doing so
may deform or damage the plastic sections. Wipe off any dirt using a dry cloth.
• The battery slowly loses power while it is not being used.
• When charging the battery, charge it in an environment that is between 10°C and 30°C.
• To prevent deterioration in the battery performance, avoid direct sunlight, high temperatures, and
high humidity, and store it in a cool location (around 20°C).
• If storing it for a long period of time, remove it from the printer or battery charger. Also, to prevent
deterioration in its performance, we recommend that you charge it approximately once per year.
Guide for charging: Battery charge status Level L
For details about the charge level, refer to the printer's User's Manual.
• If the battery life is remarkably short, the battery may have expired. Replace it with a new battery.
7
Restriction of Use
When this product is used for applications requiring high reliability/safety, such as transportation devices
related to aviation, rail, marine, automotive; disaster prevention devices; various safety devices; or functional/
precision devices, etc., you should use this product only after giving consideration to including fail-safes and
redundancies into your design to maintain safety and total system reliability. Because this product was not
intended for use in applications requiring extremely high reliability/safety, such as aerospace equipment, main
communication equipment, nuclear power control equipment, or medical equipment related to direct medical
care, etc., please make your own judgement on this product's suitability after a full evaluation.
Note about interference
• This product generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
• If this equipment does cause harmful interference to radio or television reception, which can be determined
by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more
of the following measures:
− Reorient or relocate the receiving antenna for the radio/TV.
− Increase the separation between the equipment and the radio/TV.
− Consult your dealer or an experienced radio/TV technician for help.
• Never disassemble or modify this product.
• Seiko Epson Corporation shall not be liable for interference to radio/TV resulting from changes or modifica-
tions to this product not expressly approved by Seiko Epson Corporation.
8
About this Manual
Aim of the Manual
This manual was created to provide information on the development, design, and installation of POS systems
and the development and design of printer applications for developers.
Manual Content
The manual is made up of the following sections:
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Appendix
Product Overview
Setup
Advanced Usage
Application Development Information
Handling
Product Specifications
Specifications of Interfaces and Connectors
Character Code Tables
9
10
Contents
Q For Safety..................................................................................................................................3
Key to Symbols.................................................................................................................................................................... 3
Cautions on Handling the Printer................................................................................................................................. 4
Cautions on Installation of the Printer........................................................................................................................ 4
Cautions on Handling the Single Charger ................................................................................................................ 5
Cautions on the Power Supply for the Single Charger ......................................................................................... 5
Battery Safety Precautions.............................................................................................................................................. 6
Cautions for Use and Storage of the Battery............................................................................................................ 7
Q Restriction of Use ....................................................................................................................8
Q Note about interference ........................................................................................................8
Q About this Manual ..................................................................................................................9
Aim of the Manual ............................................................................................................................................................. 9
Manual Content .................................................................................................................................................................. 9
Q Contents................................................................................................................................. 11
Product Overview ..........................................................................................15
Q Features ................................................................................................................................. 15
Q Product Configurations ...................................................................................................... 16
Interfaces.............................................................................................................................................................................16
NFC Tag................................................................................................................................................................................16
Accessories .........................................................................................................................................................................16
Q Part Names and Functions ................................................................................................. 18
Offline...................................................................................................................................................................................21
Q Power Functions ................................................................................................................... 22
Auto-Power Off .................................................................................................................................................................22
Battery Charge Modes....................................................................................................................................................22
Q Operation Mode When Battery is Low ............................................................................. 23
Mode 1 .................................................................................................................................................................................24
Mode 2 .................................................................................................................................................................................25
Q Error Status............................................................................................................................ 26
Automatically Recoverable Errors ..............................................................................................................................26
Recoverable Error .............................................................................................................................................................26
Unrecoverable Errors ......................................................................................................................................................27
Q NV Memory ........................................................................................................................... 28
NV Graphics Memory......................................................................................................................................................28
User NV Memory ..............................................................................................................................................................28
Customized Values and Memory Switches .............................................................................................................28
User-defined Page ...........................................................................................................................................................28
Maintenance Counter.....................................................................................................................................................29
11
Q Useful Functions for Smart Devices.................................................................................. 30
NFC Tag................................................................................................................................................................................ 30
QR Code .............................................................................................................................................................................. 30
Setup............................................................................................................... 31
Q Flow of Setup ........................................................................................................................ 31
Q Installing the Printer............................................................................................................ 32
Installing the Battery ...................................................................................................................................................... 33
Installing or Replacing the Roll Paper ...................................................................................................................... 35
Q Connecting the Printer........................................................................................................ 39
USB Interface ..................................................................................................................................................................... 39
Wireless LAN Interface ................................................................................................................................................... 40
Bluetooth Interface......................................................................................................................................................... 43
Advanced Usage............................................................................................ 47
Q Software Settings ................................................................................................................. 47
Q Paper Layout Setting........................................................................................................... 53
Q Settings/Check Mode .......................................................................................................... 54
Self-test mode................................................................................................................................................................... 55
NV graphics information print mode ....................................................................................................................... 56
Software settings mode ................................................................................................................................................ 56
Radio field intensity check mode...............................................................................................................................58
Wireless module setup mode...................................................................................................................................... 59
Hexadecimal dumping mode ..................................................................................................................................... 61
Q Dynamic Status Sheet Print Mode .................................................................................... 63
Wi-Fi Model........................................................................................................................................................................ 63
Bluetooth Model .............................................................................................................................................................. 64
Q EpsonNet Config (Web Version) ........................................................................................ 65
Starting EpsonNet Config (Web Version)................................................................................................................ 65
Settings ............................................................................................................................................................................... 67
12
Application Development Information.......................................................71
Q Controlling the Printer ........................................................................................................ 71
ePOS-Print XML.................................................................................................................................................................71
ESC/POS...............................................................................................................................................................................71
Q Software and Manuals ........................................................................................................ 72
Development Kits ............................................................................................................................................................72
Drivers ..................................................................................................................................................................................73
Utilities .................................................................................................................................................................................73
Others...................................................................................................................................................................................74
Download ...........................................................................................................................................................................74
Q Application Development and Distribution for iOS...................................................... 75
Handling .........................................................................................................77
Q Charging Battery .................................................................................................................. 77
Using the printer itself....................................................................................................................................................78
Battery’s charging status ...............................................................................................................................................79
Battery malfunction ........................................................................................................................................................80
Using the battery spacer (OT-BS20)...........................................................................................................................81
Q Cleaning the Printer............................................................................................................. 82
Cleaning the Printer Case ..............................................................................................................................................82
Cleaning the Thermal Head..........................................................................................................................................82
Cleaning the Platen Roller/Paper Sensor.................................................................................................................83
Cleaning the Charge Terminals...................................................................................................................................83
Appendix.........................................................................................................85
Q Product Specifications ........................................................................................................ 85
Printing Specifications....................................................................................................................................................85
Character Specifications ................................................................................................................................................86
Paper Specifications ........................................................................................................................................................88
Printable Area....................................................................................................................................................................90
Printing and Cutting Positions ....................................................................................................................................90
Electrical Characteristics................................................................................................................................................91
Reliability.............................................................................................................................................................................91
Environmental Conditions ............................................................................................................................................91
External Dimensions and Mass ...................................................................................................................................93
Colors....................................................................................................................................................................................93
Q Specifications of Interfaces and Connectors .................................................................. 94
USB Interface .....................................................................................................................................................................94
Wireless LAN Interface....................................................................................................................................................95
Bluetooth Wireless Interface ........................................................................................................................................98
NFC Tag............................................................................................................................................................................. 101
Q Character Code Tables....................................................................................................... 102
13
14
Product Overview
This chapter describes features and specifications of the TM-P20, a portable receipt printer.
Features
TM-P20 is a thermal mobile printer. The main features of this product are as follows.
Printing
Maximum printing speed of 100 mm/s is possible.
Printer handling
• Compact body (Approximately 221 g/Wi-Fi® model, Approximately 212 g/Bluetooth® model)
Chapter 1 Product Overview
1
• Drop impact resistance from a height of 2 m (compliant with JIS C60068-2-31: 2013)
• Dust-proof performance (IP4X equivalent)
• Soft case for higher dust-proof and splash-proof performance (IP54)
• Easy drop-in paper loading
• Belt clip for improved portability in a mobile environment
• The direct connection without Wi-Fi access point brings a simplified configuration procedure of network
settings. (SimpleAP mode)
Software
• NFC tag built into the printer unit for printing to a touched printer
• Printing triggered by bar code scan by smart device camera
• Utility for iOS/Android provides a user-friendly wizard to simplify the connection for smart devices
(Epson TM Utility for iOS/Android
™)
Interfaces
• Either wireless LAN interface (IEEE802.11a/b/g/n) or Bl uetooth interface is installed by factory option.
• USB interface is standard equipment.
Environment
Has a paper-saving function.
15
Product Configurations
NFC Tag
Interfaces
• Wi-Fi model (IEEE802.11 + USB)
• Bluetooth model (Bluetooth + USB)
Wireless or USB is available. When you connect to the host with a USB cable and the printer is turned
on, the USB interface is selected.
NFC Tag
You can perform wireless setup for terminals that support NFC by placing the terminal close to the NFC tag
(mark) on the printer.
∗ There is no Read/Write function.
Accessories
Included
• Thermal roll paper (for operation check)
• Battery (OT-BY20)
• Single charger (OT-SC20)
• AC adapter (AC adapter, C)
• AC cable
• Belt clip (attached to the printer)
• USB cable (1.2m {4 feet} long)
• Setup Guide (Wi-Fi / Bluetooth)
• CD-ROM
• Warranty certificate
∗1 May vary depending on the model or region.
∗2 May not be included, depending on the model.
*1
*2
16
Options
• Battery (OT-BY20)
• Single charger (OT-SC20)
• Quad charger (OT-MC20)
• Battery spacer (OT-BS20)
• Soft case (OT-PC20)
Chapter 1 Product Overview
1
17
Part Names and Functions
Roll paper cover
Control panel
Open button
Belt clip
NFC Tag
Single charger
Manual cutter
Connector for the USB
Roll Paper Cover
Open this cover to install or remove the roll paper.
Open Button
Push this button to open the roll paper cover.
Connector for the USB
Connect the USB interface cable.
Belt clip
Use this clip to hang the printer on your belt.
18
Chapter 1 Product Overview
Feed button
Battery LED
Charge LED
Error LED
Power LED
Power button
1
Buttons
Power Button
Press this button to turn the printer on. Press this button for 2 seconds or more to turn the printer off.
• After the power button is pressed, it takes the following time before the printer is initialized.
Establishing a wireless communication takes longer than the following.
∗ IEEE802.11a/b/g/n: Approx. 10 sec. after the Power LED comes on.
∗ Bluetooth: Approx. 2 sec. after the Power LED comes on.
• The printer does not operate and the LEDs go out when the battery is not installed in the
printer.
• To turn the printer on immediately after turning the printer off, wait until the LEDs go off.
Feed button
• When Paper Type Setting is set to Receipt paper (without black mark), pressing this button once feeds paper
by one line. Holding this button down feeds paper continuously.
• When Paper Type Setting is set to Receipt paper (with black mark), pressing this button feeds paper to the
print starting position on the next black mark.
Enabling/disabling of the Feed button can be selected by a command. If the command is set to
disable the button, it does not function.
19
LEDs
Power LED (Blue)
The printer does not operate and the LEDs go out when the battery is not installed in the printer.
• Lights when the power is on.
• Goes out when the power is turned off.
• Flashes when the printer is powering-off or while the Feed button is being pressed in the software setting
mode. With the Wi-Fi model, it flashes also when the printer is being initialized after the power is turned on.
Error LED (Orange)
• Lights when the printer is offline. (For details about offline, see "Offline" on page 21.)
• Flashes when an error occurs. (For details about the flash codes, see
• Goes out during normal operation (online).
"Error Status" on page 26.)
Battery LED (Blue)
The remaining battery charge is indicated by three LEDs only when the battery is installed in the printer. For
details, see
"Operation Mode When Battery is Low" on page 23.
Charge LED (Orange)
The Charge LED is located on the single charger (OT-SC20) and quad charger (OT-MC20).
• Lights when the battery is being charged.
• Off when the battery is not being charged.
• Flashes when there is abnormality in battery charging.
20
Chapter 1 Product Overview
Offline
The printer automatically goes offline and stops printing under the following conditions. Once all of the
following conditions are cleared, the printer becomes online and ready to print.
• During power on until the printer is ready
• While roll paper is being fed using the Feed button
• When the roll paper cover is open
• When paper is out
• When an error has occurred
• While waiting for the switch for executing the macro to be on
• While the printer is shutting down
• When the remaining battery charge is at level E
• When the battery malfunction is detected
• The Error LED lights during offline. However, it flashes when an error has occurred.
• For details about the battery charge levels and operation modes, see
Battery is Low" on page 23
• You can select whether or not to stop command processing off-line with the customized
value. To set the customized value, see
• The buzzer beeps five times when there is no more paper or an error has occurred. You can
disable the buzzer with the memory switches. For details on the memory switch settings, see
"Software Settings" on page 47.
.
"Software Settings" on page 47.
"Operation Mode When
1
21
Power Functions
You can customize the printer using the power functions, the auto-power off function and battery charge mode
function to save the battery power or minimize the battery deterioration.
Auto-Power Off
The printer automatically turns off once the specified time has elapsed in the idle state.
However, when the printer is in the following status, it is not considered as idle state, and the auto-power off
function is not applied.
• Printer is off-line
• Remaining battery amount is at S level
The auto-power off time is selectable with the customized value. To set the customized value, see
"Software Settings" on page 47.
Battery Charge Modes
The printer has two battery charge modes and is initially set to the mode 1.
The battery charge mode is selectable with the customized value. To set the customized value, see
"Software Settings" on page 47.
Mode 1
Suitable for battery-powered operation.
In Mode 1, battery charging is controlled so that the battery is always fully charged.
Mode 2
Suitable for the printer that is always connected to the single charger.
In Mode 2, battery charging is controlled so that the battery is about 80% charged.
22
Chapter 1 Product Overview
Operation Mode When Battery is Low
There are two operation modes for the printer when the battery is low. Change the mode depending on the
usage status.
Mode 1 (initial setting):
Continues printing until the remaining battery becomes approximately 0%. This is appropriate if you want to
maximize the battery operation time. However, the printer may stop during the printing or print quality may
decrease when the remaining battery becomes near 0%.
Mode 2:
Stops printing when the remaining battery becomes approximately 10%. This is appropriate if you want to avoid
that the printer stops during the printing.
• When the amount of charge remaining in the battery reaches the L level, we recommend
replacing or charging the batteries.
• When the amount of charge remaining in the battery reaches the S or E level, we recommend
replacing or charging the batteries.
• The operation mode when battery is low is selectable with the customized value. To set the
customized value, see
• The buzzer beeps five times when the remaining battery charge goes down to the levels L or S.
You can disable the buzzer with the memory switches. To set the memory switches, see
"Software Settings" on page 47.
• Before printing starts, the amount of charge remaining in the battery is detected, and the
display is updated after printing. The battery LED display does not detect the amount of
charge remaining in the battery in real time.
"Software Settings" on page 47.
1
23
Mode 1
: On : Flash : Off
Battery LED Error LED
Level H
Level M
Level L
Level S
Level E
∗ Printing may be interrupted.
Remaining
battery charge
Approx. 60 ∼ 100% Possible Possible
Approx. 20 ∼ 60% Possible Possible
Approx. 10 ∼ 20% Possible Possible
Approx. below 10% Possible* Possible
Approx. 0% Impossible Impossible
Printing Communication
24
Mode 2
: On : Flash : Off
Chapter 1 Product Overview
Level H
Level M
Level L
Level S
Level E
Battery LED Error LED
Remaining
battery charge
Approx. 60 ∼ 100% Possible Possible
Approx. 40 ∼ 60% Possible Possible
Approx. 20 ∼ 40% Possible Possible
Approx. 10 ∼ 20% Possible Possible
Approx. below 10% Impossible Impossible
Printing Communication
1
25
Error Status
LED ON
LED OFF
Approx. 320 ms
LED ON
LED OFF
Approx. 320 ms
LED ON
LED OFF
Approx. 320 ms
When an error occurs, the printer stops printing, goes offline, and the Error LED flashes.
There are three error types: automatically recoverable errors, recoverable errors, and unrecoverable errors.
Automatically Recoverable Errors
Printing is temporarily suspended when automatically recoverable errors occur. They can recover automatically,
as described below.
Error Error description Error LED flash code Recovery measure
Paper error The black mark cannot
be detected.
Temp e r a ture error
The temperature of
the print head, motor
driver IC, or battery is
high.
Recovers automatically
when the cover is opened.
Recovers automatically
when the temperature
goes down.
Recoverable Error
Printing is no longer possible when a recoverable error occurs. They can be recovered easily by sending an error
recovery command after eliminating the cause of the error.
Error Error description Error LED flash code Recovery measure
Paper
layout error
The paper layout differs from the actual
paper. Paper jam
occurs.
The error recovery command is valid only if a recoverable error (excluding automatically recoverable
errors) occurs.
Recovers by sending an
error recovery command
(“DLE ENQ”).
26
Chapter 1 Product Overview
LED ON
LED OFF
Approx. 5.12 s
LED ON
LED OFF
Approx. 320 ms
LED ON
LED OFF
Approx. 320 ms
Unrecoverable Errors
Printing is no longer possible when unrecoverable errors occur. If the same error occurs again even after
turning the power back on, contact qualified service personnel.
Immediately turn off the power and remove the battery when unrecoverable errors occur.
CAUTION
Error Error description Error LED flash code
Internal circuit
error
R/W error in
memory
High voltage
error
Overload error The temperature of the print head
CPU execution
error
Wireless
communication
unit error
Internal circuits are not connected
correctly.
After R/W checking, the printer does
not work correctly.
The power supply voltage is high.
or battery is extremely high or low.
The CPU is executing an incorrect
address.
Wireless communication does not
work correctly or the wireless communication unit is disconnected.
1
LED ON
LED OFF
Approx. 320 ms
LED ON
LED OFF
Approx. 320 ms
LED ON
LED OFF
Approx. 320 ms
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NV Memory
The printer's NV memory (Non-Volatile memory) stores data even after the printer power is turned off. NV
memory contains the following memory areas for the user:
• NV graphics memory
• User NV memory
• Customized values and memory switches
• User-defined page
• Maintenance counter
As a guide when you program applications, NV memory should be rewritten 10 or fewer times a day.
NV Graphics Memory
Graphics, such as shop logos to be printed on receipts, can be stored. Even if communication speed is low, high
speed graphic printing is possible.
Use the TM-P20 Utility to register graphics. You can also print and confirm the registered graphics in the TMP20 Utility or NV graphics print mode.
• For detailed information about the TM-P20 Utility, see the TM-P20 Utility User’s Manual.
• To use the NV graphics print mode, see
"NV graphics information print mode" on page 56.
User NV Memory
You can store and read text data for multiple purposes, such as for storing a note including customizing or
maintenance information of the printer.
Use ESC/POS commands to store and read the text data.
For detailed information about ESC/POS commands, see the ESC/POS Command Reference (see
POS" on page 71
).
"ESC/
Customized Values and Memory Switches
With the customized values and memory switches, which are software switches for the printer, you can
configure various settings of the printer.
To set the customized values and memory switches, see
"Software Settings" on page 47.
User-defined Page
You can store character data in the user-defined page (character code table: page 255) so that you can also print
characters not resident in the printer.
28
Chapter 1 Product Overview
Maintenance Counter
With this function, printer information, such as the number of lines fed, and printer operation time after the
printer starts working, is automatically stored in NV memory. You can read or reset the information with TMP20 Utility, the Status API of the APD, or OPOS ADK to use it for periodical checks or part replacement.
Maintenance counter values are usually saved every two minutes except in the power saving status.
However, if the printer power is turned off by removing the battery or using up the battery charge, the
latest maintenance counter will not be saved. For detailed information about ESC/POS commands,
see the ESC/POS Command Reference (see
"ESC/POS" on page 71).
1
29
Useful Functions for Smart Devices
You can easily connect this product to the network by using the NFC tag built-in to the printer or the QR code
printed on the status sheet.
NFC Tag
Bring a smart device that supports NFC close to the NFC tag to acquire the printer information (information
for specifying the device).
Specify the target printer using the acquired information to connect to the network.
QR Code
Capture the QR code printed on the status sheet with the camera on your smart device to acquire the printer
information (information for specifying the device).
Specify the target printer using the acquired information to connect to the network.
• Programming using Epson ePOS SDK is required to use these functions. These functions are
created by combining NFC touch and QR code capturing operations and the target printer
specifications using Printer Easy Select API.
See the "Epson ePOS SDK for Android/iOS User's Manual" and the Epson ePOS SDK sample
program for more details. The sample program also contains a sample implementation method for
reading an NFC tag and capturing a QR code.
• You can try a demo of these functions by using Epson TM Utility for iOS/Android.
30